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  2017, Vol. 36 Issue (6): 1469-1478    DOI: 10.13722/j.cnki.jrme.2016.1457
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The pretreatment mechanism of tunnels and its calculation method based on the incomplete arch effect
YE Fei1,FAN Kangjia1,SONG Jing1,DUAN Zhijun1,JIA Tao2
(1. School of Highway,Chang?an University,Xi?an,Shaanxi 710064,China;2. Beijing Urban Construction Design
and Development Group Co.,Ltd.,Beijing 100037,China)
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Abstract  In the tunnel excavation,the deformation of the soil core in front of the surface of tunnel excavation may stimulate the arch effect in the surrounding soil ahead of the tunnel face. This kind of arch effect is different from the one produced behind the tunnel face and is called the incomplete arch effect. The performance of the incomplete arch effect is closely related to the pre-convergence deformation and extrusion. The formulas for calculating the soil pressure around the front soil core considering the incomplete arch effect are proposed and are different from Terzaghi formula,because in the proposed method,an angle between the fracture face and vertical direction is assumed and the effect of the pre-convergence deformation on the surrounding soil pressure and the non-vertical sliding surface effect of cohesive soils are taken into consideration. The results show that as the increase of the pre-convergence deformation,the earth pressure exhibits three stages:the rapid near-linear decrease,the slow decrease and the stable ones. The earth pressure decreases with the increase of internal friction angle,thickness-span ratio and cohesion. However,the earth pressure increases with the increase of the angle of rupture surface. The formula for calculating the reinforcement parameters of the front soil core based on ADECO-RS is deduced and its applicability is verified in a case study.
Key wordstunnelling engineering      incomplete arch effect      the advanced core soil      analysis of controlled deformation in rock and soils(ADECO-RS)      theoretical analysis     
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YE Fei1
FAN Kangjia1
SONG Jing1
DUAN Zhijun1
JIA Tao2
Cite this article:   
YE Fei1,FAN Kangjia1,SONG Jing1, et al. The pretreatment mechanism of tunnels and its calculation method based on the incomplete arch effect[J]. , 2017, 36(6): 1469-1478.
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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.1457      OR      http://www.rockmech.org/EN/Y2017/V36/I6/1469
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